How to reveal type of material nodes in 2.8
This seems to be a Node Group.
It is not a node by itself - rather a kind of a directory/folder.  

It contains a node tree, with different inputs and outputs.
To enter or leave it press ⇥ Tab or the little top right arrow  

Inside of a node group.


It is used to organize complex node trees, or sharing node trees across materials.
You can also rename your group, or the nodes inside of it - so it's easier to navigate.

Further reading:
Node Groups Page in Blender Manual